* upstream/master:
  libhb: rename video fifo

It's been a little while since mpeg2 and mpeg4 were the only supported formats.

* upstream/master:
  nal_units: remove sei limit
  encavcodec: set pict type and disposable flag

None of the encoder we use set the disposable flag,
but it might be helpful in the future.

* upstream/master:
  libhb: clean up dead code and comments
  qsv: enable QSV encoder via FFmpeg API (#6446)
  encavsub: use av_free to free the buffer

* qsv: enable QSV encoder via FFmpeg API

Co-authored-by: Kesy, Anton <anton.kesy@intel.com>

* qsv: renamed Intel Media SDK to Intel QSV

* qsv: fixed BT2020 -> BT709 conversion

* qsv: fixed format specifier

* qsv: fixed missing spaces

* qsv: removed av_buffer_ref

* qsv: revert back sw_format for other encoders

* qsv: fix codec level not set

Co-authored-by: Kesy, Anton <anton.kesy@intel.com>

* qsv: fixed the build for non qsv configurations

---------

Co-authored-by: Kesy, Anton <anton.kesy@intel.com>

* upstream/master:
  WinGui: When loading the queue from JSON, load the scanned track first so it doesn't cause bad interactions with the track name property. Should fix #6712
  contrib: update to SVT-AV1 3.0.1 (#6709)

WinGui: When loading the queue from JSON, load the scanned track first so it doesn't cause bad interactions with the track name property. Should fix #6712

* upstream/master:
  MacGui: use UNUserNotificationCenter only on 10.15 and later
  MacGui: set toolbar items target to make them validate properly
  MacGui: try to work around a UNUserNotificationCenter issue on macOS 10.14
  Update flatpak.yml - Rename artifact
  WinGui: Improve coverart infrastructure code.
  WinGui: Parse Coverart Data from the source and link to the "Passthru Common Metadata" UI checkbox.
  cli: add an option to disable metadata passthru
  libhb: expose the cover arts in the title and job json

Try to avoid a crash on macOS 10.14

* upstream/master:
  WinGui: Upgrade the update checker to use a stronger 4096bit RSA public key.
  encavsub: fix a small leak
  libhb: preserve multiple cover arts and their filenames
  MacGui: do not copy cover arts if metadata passthru is disabled

* upstream/master:
  Update NEWS
  contrib: update to FFmpeg 7.1.1 (#6689)
  contrib: update HarfBuzz to 10.4.0 (#6660)
  subtitles: fix SSA passthru to MKV
  dectx3gsub: use a generic ssa header
  MacGui: zero out hb_subtitle_config_t
  encavsub: set default font size when converting from tx3g to subrip
  libhb: fix leaks
  subtitles: switch back to libhb tx3g decoder and encoder
  subtitles: convert srt/utf-8 subtitles back to subrip format
  encavsub: add libav subtitle encoder
  decavsub: use libav for decoding TX3G subs
  decavsub: check extradata, it might be null for some codecs
  subtitles: don't add extra null byte to extradata
  ssautil: fix ssa to tx3g conversion
  decavsub: add error checking
  subtitles: initialize extradata in demuxers
  subtitles: add subtitle encoder pipeline stage
  subtitles: wire up writing of external ssa and pgs

New addition to the struct were not initialised and contained random data

FFmpeg ones need a bit of additional testing.

FFmpeg uses SSA as the internal subtitles format, and unstyled subtitles were converted to SSA too, with a default set of styles. Convert them back to the simpler srt/utf-8 format when muxing them in MKV.

So far it's only used for converting ASS subs to TX3G subs.